[Summer of code] Let controller become role state after append initial logs (#4442)

* fix bug

* fix bug

controller/src/main/java/org/apache/rocketmq/controller/impl/DLedgerController.java

@@ -403,7 +403,6 @@ public class DLedgerController implements Controller {
                         DLedgerController.this.stopScheduling();
                         break;
                     case LEADER: {
-                        this.currentRole = MemberState.Role.LEADER;
                         log.info("Controller {} change role to leader, try process a initial proposal", this.selfId);
                         // Because the role becomes to leader, but the memory statemachine of the controller is still in the old point,
                         // some committed logs have not been applied. Therefore, we must first process an empty request to dledger,
@@ -414,6 +413,7 @@ public class DLedgerController implements Controller {
                             request.setBody(new byte[0]);
                             try {
                                 if (appendToDledgerAndWait(request)) {
+                                    this.currentRole = MemberState.Role.LEADER;
                                     DLedgerController.this.startScheduling();
                                     break;
                                 }

controller/src/main/java/org/apache/rocketmq/controller/impl/DLedgerControllerStateMachine.java

@@ -54,8 +54,8 @@ public class DLedgerControllerStateMachine implements StateMachine {
             if (body != null && body.length > 0) {
                 final EventMessage event = this.eventSerializer.deserialize(body);
                 this.replicasInfoManager.applyEvent(event);
-                applyingSize++;
             }
+            applyingSize++;
         }
         log.info("Apply {} events on controller {}", applyingSize, this.dledgerId);
     }